# Step 2 16k Exp 202412 vs Step 5 Preview

> Step 5 Preview is the stronger model overall, scoring 43.8 to 38.6 on the Noometry Index.

- Canonical page: https://noometry.com/compare/step-2-16k-exp-202412-vs-step-5-preview
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in reasoning, where Step 5 Preview leads 38.0 to 24.8.

## Snapshot

| | Step 2 16k Exp 202412 | Step 5 Preview |
|---|---|---|
| Provider | StepFun | StepFun |
| Noometry Index | 38.6 | 43.8 |
| Rank | 173 | 78 |
| Context | — | 1.02M |
| Input $/M | — | $1 |
| Output $/M | — | $2.70 |
| Weights | Proprietary | Proprietary |

## Coding

- Step 2 16k Exp 202412: 37.9 (#170)
- Step 5 Preview: 50.6 (#40)

| Benchmark | Step 2 16k Exp 202412 | Step 5 Preview |
|---|---|---|
| LMArena WebDev | — | 1569 |
| SciCode | — | 58.9% |
| LMArena Coding | 1316 | — |

## Reasoning

- Step 2 16k Exp 202412: 24.8 (#140)
- Step 5 Preview: 38.0 (#58)

| Benchmark | Step 2 16k Exp 202412 | Step 5 Preview |
|---|---|---|
| CritPt | — | 20.9% |
| LMArena Hard Prompts | 1299 | — |

## Math

- Step 2 16k Exp 202412: 33.6 (#171)
- Step 5 Preview: —

| Benchmark | Step 2 16k Exp 202412 | Step 5 Preview |
|---|---|---|
| LMArena Math | 1305 | — |

## Knowledge

- Step 2 16k Exp 202412: 34.6 (#187)
- Step 5 Preview: —

| Benchmark | Step 2 16k Exp 202412 | Step 5 Preview |
|---|---|---|
| LMArena Expert | 1279 | — |

## Multilingual

- Step 2 16k Exp 202412: 43.9 (#176)
- Step 5 Preview: —

| Benchmark | Step 2 16k Exp 202412 | Step 5 Preview |
|---|---|---|
| LMArena Non-English | 1290 | — |
| LMArena Chinese | 1331 | — |
| LMArena Russian | 1324 | — |

## Instruction Following

- Step 2 16k Exp 202412: 68.1 (#187)
- Step 5 Preview: —

| Benchmark | Step 2 16k Exp 202412 | Step 5 Preview |
|---|---|---|
| LMArena Instruction Following | 1287 | — |

## Long Context

- Step 2 16k Exp 202412: 39.7 (#165)
- Step 5 Preview: —

| Benchmark | Step 2 16k Exp 202412 | Step 5 Preview |
|---|---|---|
| LMArena Longer Query | 1307 | — |

## Writing & Preference

- Step 2 16k Exp 202412: 52.5 (#168)
- Step 5 Preview: —

| Benchmark | Step 2 16k Exp 202412 | Step 5 Preview |
|---|---|---|
| LMArena Text | 1321 | — |
| LMArena Creative Writing | 1328 | — |
| LMArena Multi-Turn | 1292 | — |

## FAQ

### Is Step 2 16k Exp 202412 better than Step 5 Preview?

Step 5 Preview is the stronger model overall, scoring 43.8 to 38.6 on the Noometry Index.

### Is Step 2 16k Exp 202412 or Step 5 Preview better for coding?

Step 5 Preview scores higher on coding benchmarks: 50.6 versus 37.9 in the Noometry coding category.

### How many benchmarks do Step 2 16k Exp 202412 and Step 5 Preview share?

0 benchmarks have published results for both models. Step 2 16k Exp 202412 has 12 scored results on Noometry and Step 5 Preview has 3.